package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 微信用户登录
     *
     * @param userLoginDTO 登录用户信息
     * @return User
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口获取openId
        String openId = getWxOpenId(userLoginDTO.getCode());
        //判断openId的合法性
        if (openId == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //是否为新用户 ，是 注册 否 登录
        User user = userMapper.getByOpenId(openId);

        if (user == null) {
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        return user;
    }

    /**
     * 获取微信openId
     * @param code
     * @return
     */
    private String getWxOpenId(String code) {
        Map<String, String> loginMap = new HashMap<>();
        loginMap.put("appid", weChatProperties.getAppid());
        loginMap.put("secret", weChatProperties.getSecret());
        loginMap.put("js_code", code);
        loginMap.put("grant_type", "authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN, loginMap);

        JSONObject jsonObject = JSON.parseObject(json);

        return jsonObject.getString("openid");
    }
}
